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Background/Introduction <p>Magnetic gears offer significant advantages for wind power applications, including no mechanical loss, no lubrication, and&#xa0;inherent overload protection. However, conventional designs are limited by issues such as weak magnetic modulation, low torque&#xa0;density, structural complexity, magnetic saturation, and leakage flux, which restrict their practical use in wind energy systems.</p> Purpose <p>This paper aims to address the aforementioned limitations by proposing a novel modulation-enhanced&#xa0;monotonic magnetic ring double-modulation three-rotor magnetic gear. The goal is to improve torque density and&#xa0;overall performance, thereby enhancing the applicability of magnetic gears in wind power transmission.</p> Methods <p>First, simulation analysis was conducted to verify the feasibility of the proposed hybrid multi-magnetic&#xa0;circuit monotonic magnetic ring double-modulation three-rotor coaxial magnetic gear in comparison to a traditional&#xa0;structure. Second, single-factor tests and Plackett-Burman screening tests were employed to identify key factors&#xa0;significantly influencing torque performance. Third, the Box-Behnken experimental design was used to analyze&#xa0;these key factors, construct a response surface model, and perform multi-objective optimization. Finally, a&#xa0;Halbach array was applied to suppress torque ripple.</p> Results <p>After optimization, the torque density of the magnetic gear increased by 4.95%, although the torque ripple&#xa0;of the inner and outer rotors initially increased to 18.09% and 11.5%, respectively. Following magnetization with&#xa0;the Halbach array, the output torque further increased by 4.86%, and the torque ripples of the inner, middle, and&#xa0;outer rotors were reduced to 10.59%, 9.42%, and 7.94%, respectively.</p> Conclusions <p>This research provides a new design concept for magnetic transmission structures and&#xa0;demonstrates the promising application potential of magnetic gears in future transmission systems, particularly in&#xa0;achieving higher torque density and lower torque ripple.</p>

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Electromagnetic Performance Analysis and Multi-Objective Optimization of Hybrid Multi-Circuit Monotonic Magnetic Ring Dual-Modulated Three-Rotor Coaxial Magnetic Gear

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Jungang Wang,
  • Chuntao Zhang,
  • Ruina Mo,
  • Shizhao Wang

摘要

Background/Introduction

Magnetic gears offer significant advantages for wind power applications, including no mechanical loss, no lubrication, and inherent overload protection. However, conventional designs are limited by issues such as weak magnetic modulation, low torque density, structural complexity, magnetic saturation, and leakage flux, which restrict their practical use in wind energy systems.

Purpose

This paper aims to address the aforementioned limitations by proposing a novel modulation-enhanced monotonic magnetic ring double-modulation three-rotor magnetic gear. The goal is to improve torque density and overall performance, thereby enhancing the applicability of magnetic gears in wind power transmission.

Methods

First, simulation analysis was conducted to verify the feasibility of the proposed hybrid multi-magnetic circuit monotonic magnetic ring double-modulation three-rotor coaxial magnetic gear in comparison to a traditional structure. Second, single-factor tests and Plackett-Burman screening tests were employed to identify key factors significantly influencing torque performance. Third, the Box-Behnken experimental design was used to analyze these key factors, construct a response surface model, and perform multi-objective optimization. Finally, a Halbach array was applied to suppress torque ripple.

Results

After optimization, the torque density of the magnetic gear increased by 4.95%, although the torque ripple of the inner and outer rotors initially increased to 18.09% and 11.5%, respectively. Following magnetization with the Halbach array, the output torque further increased by 4.86%, and the torque ripples of the inner, middle, and outer rotors were reduced to 10.59%, 9.42%, and 7.94%, respectively.

Conclusions

This research provides a new design concept for magnetic transmission structures and demonstrates the promising application potential of magnetic gears in future transmission systems, particularly in achieving higher torque density and lower torque ripple.